Not something I've noticed myself. I usually use the software in Fullscreen mode and depending on my mood, activate all cards unless I want to watch one or two particular cards. Therefore, I usually see a good mix of old and new cards. I admit that there are a few Vegas produced cards that left me wanting a little extra spice...
Re: Stripping too fast? I guess it all comes down to what mood we are in. Some days, after a gruelling marathon of work, I just want to chuck one out quick and dirty! That usually means nudity. Other days, I can play with my girls for hours, enjoying their beauty for it's own sake :)
My last few cards are wonderful. They all have a place for what I'm feeling at any given time :D